Alright, let's work through 51002671 times 87979894 step by step
51002671 × 87979894 = 87979894 × (51002671)
+ 87979894 × 1 what gives us 87979894
+ 87979894 × 70 that results in 6158592580
+ 87979894 × 600 that equals 52787936400
+ 87979894 × 2000 yielding 175959788000
+ 87979894 × 00000 that is equal 0
+ 87979894 × 000000 what gives us 0
+ 87979894 × 1000000 which equals 87979894000000
+ 87979894 × 50000000 resulting in 4398994700000000

= 4487209588296874
